Quenching device for drill steels



Dec. 3, 1929. c. CTHANSEN 1,738,050

' QUENCHING DEVICE FOR DRILL STEELS Filed Jan. 28, 1928 IN V EN TOR.

Chadd 1611' 225912 BY L ' H123 ATTO NEY Patented Dec. 3, 1929 UNITED STATES PATENT OFFICE CHARLES C. HANSEN, OF EASTON, PENNSYLVANIA, ASSTGNOR 'IO INGEBSOLL-RAND COMPANY, OF JERSEY CITY, NEXV JERSEY, A CORPORATION OF NEW JERSEY QUENGHING DEVICE FOR DRILL STEELS Application filed January 28, 1928;

This invention relates to quenching de vices, but more particularly to a quenching device for drill steels.

It is an object of the present invention to assure uniform quenching of heated articles and to prevent the formation of air bubbles on the surface thereof during the quenching operation and consequent soft spots in the body of the hardened article.

Other objects will be in part obvious and in part pointed out hereinafter.

The invention consists of the combination of elements and arrangement of parts having the general mode of operation substan' tially as hereinafter described and claimed and illustrated in the accompanying drawings, in which Figure 1 is a side elevation, partly in sec tion, of the quenching unit, and

Figure 2 is a sectional plan view of a de tail taken through Figure 1 on the line 22 looking in the direction indicated by the arrows.

Referring to the drawings, A designates a tank containing quenching liquid 13 WlllCll may be introduced in the tank A through an opening C. An overflow pipe D connected to the tank A serves to maintain a constant level in the tank and conveys any excess liquid to the source of supply (not shown).

The tank A in this instance is supported by a foundation E which also serves as a support for a pump F communicating with the tank A through a pipe G. Any suitable prime mover may be utilized for actuating the pump F. In the drawings a motor H connected to the pump by means of a belt J is used for this purpose.

The pump F may be of any suitable type and has a discharge pipe K which preferably extends over the tank A. In the discharge pipe K is interposed a casing L having a chamber 0 through which the liquid flows from one section of the discharge pipe K to the other. In the present instance the casing L is raised somewhat above the tank A and a branch pipe P is connected to the casing for conveying liquid from the chamber 0 to the tank A.

The casing L is provided with a manually Serial No. 250,287.

operable valve Q which in one position covers the entrance to the branch pipe P, thus directing liquid from one section of the dis charge pipe K to the other, and in another position, cuts off communication between the sections of the discharge pipe connected to the opposite end of the casing for directing the liquid. B from the discharge pipe into the tank A.

Suitable means are provided for converting the liquid into a spray and for directing such spray on the heated end of a working implement, as for instance, the bit R of a drill steel S. These means comprise a nozzle body T threaded to the end of the discharge pipe K and a nozzle cap U secured to the nozzle body by means of bolts V. The nozzle cap U preferably has a dome-shaped projection WV which extends into a cavity X in the nozzle body T and in its outer surface has a socket Y toreceive and support the bit end R of the drill steel S.

In order to direct the liquid in the cavity X on the bit R of the drill steel and to reduce such liquid into the form of a spray, the dome-shaped projection TV is provided with a plurality of small apertures Z which converge toward the axis of the socket Y so that the spray issuing therefrom will come into direct contact with the entire surface of the heated article, such as the bit R of the drill steel. The nozzle body T is preferably provided with additional supporting means other than the discharge pipe K and in this instance a frame 6 is mounted on the top of the tank A and the nozzle body T is secured to said frame by means of bolts 0.

The operation of the device is as follows: l/Vhenever it is desired to quench the heated bit of a drill steel, said bit may be inserted in the socket Y whereby it will be maintained substantially coaxially with the point of convergence of the apertures Z. With the pump F in operation, liquid will be pumped from the tank A through the discharge pipe K into the cavity X from whence it will is sue through the apertures Z against the heated drill bit under pressure. In View of this fact, the fluid will strike the drill bit with considerable force and will. prevent the v formation of air bubbles on the heated surface. The bit R will therefore be hardened uniformly.

'While the liquid is thus being forced through the apertures Z, the valve Q, of course occupies a position to prevent the flow of liquid from the casing L into the tank A. After the drill bit has been quenched, however, the valve Q may be rocked into a position to prevent the flow of liquid into the cavity X and liquid pumped into the chamber 0 of the casing L will then flow therefrom through the branch pipe P and be returned again to the tank A.

As will be readily appreciated, the pump F may be in continuous operation and the course of the liquid may be controlled entirely by proper manipulation of the valve Q.

The present invention is particularly adapted 'for drill steels of great length. Such steels are not only difficult to maneuver into a position to immerse the drill bit into the ordinary type of quenching" tank but, due to the angle at which it is necessary to insert such drill steels, one side of the heated bit of necessity enters; the liquid be fore the other, with the consequence, that uneven hardening of the drill bit takes place "lhe present invention completely overcomes .the aforesaid difficulties. It is inexpensive to install and to maintain, and assures uniform' hardening of the drill bits.

I a m .v

A quenching device,comp,rising a nozzle body having a cavity for quenching liquid, a nozzle, ca'padapted' to be secured to the nozzle body, a dome-shaped projection on the nozzle cap extending into the cavity and having a, cylindrical" socket to, sup, ort an articleintended to be quenched, an a plurality of radially arranged apertures inthe projection to introduce'jets of liquid into the socket and converging on the longitudinalaxis of the, socket to assure uniform quenching of such article;

' In testimony whereof I have signed this specification. a p

' CHARLES C. HANSEN. 

